The invention provides a shield tunnel segment. The shield tunnel segment comprises a segment shell and multiple reinforcement cages, the segment shell is formed through splicing of a front wall piece, a rear wall piece, an upper wall piece, a lower wall piece, a left wall piece and a right wall piece, the front wall piece, the rear wall piece, the upper wall piece, the lower wall piece, the leftwall piece and the right wall piece are made of high-property concrete or ultra-high-property concrete, any five in the front wall piece, the rear wall piece, the upper wall piece, the lower wall piece, the left wall piece and the right wall piece are spliced to form a containing cavity with a unique opening, one remaining piece can be detachably mounted on the opening of the containing cavity, the reinforcement cages are embedded in the containing cavity from the opening and are poured and fixed through concrete, according to the segment, a steel mold forming manner in a traditional segment manufacturing process can be replaced, on the premise of ensuring design strength needs, the manufacturing engineering time of the segment can be effectively shortened, the segment manufacturing cost can be effectively reduced, and the whole economic benefits can be improved.